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- W4367834863 abstract "The interplay of topological characteristics in real space and reciprocal space can lead to the emergence of unconventional topological phases. In this Letter, we implement a novel mechanism for generating higher-Chern flat bands on the basis of twisted bilayer graphene (TBG) coupled to topological magnetic structures in the form of the skyrmion lattice. In particular, we discover a scenario for generating |C| = 2 dispersionless electronic bands when the skyrmion periodicity and the moiré periodicity match. Following the Wilczek argument, the statistics of the charge-carrying excitations in this case is bosonic, characterized by electronic charge Q = 2e, which is even in units of electron charge e. The skyrmion coupling strength triggering the topological phase transition is realistic, with its lower bound estimated as 4 meV. The Hofstadter butterfly spectrum results in an unexpected quantum Hall conductance sequence ±2e2h,±4e2h,... for TBG with the skyrmion order." @default.
- W4367834863 created "2023-05-04" @default.
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- W4367834863 date "2023-05-03" @default.
- W4367834863 modified "2023-10-01" @default.
- W4367834863 title "Unconventional Flat Chern Bands and 2<i>e</i> Charges in Skyrmionic Moiré Superlattices" @default.
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- W4367834863 doi "https://doi.org/10.1021/acs.nanolett.3c00121" @default.
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